Do National League teams play American League?

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Tags

1. #first
2. #national
3. #regular
4. #season
5. #divisions
6. #league
7. #various
8. #where
9. #games
10. #instituted
11. #baseball
12. #competed
13. #history
14. #interleague
15. #teams
16. #during
17. #against
18. #american
19. #competition
20. #format
21. #campaign
22. #major